GEOM's RAID level support

[Pawel Jakub Dawidek]

On Thu, Oct 06, 2005 at 01:27:00PM -0700, Danny Howard wrote:
+> On Thu, Oct 06, 2005 at 10:16:16PM +0200, Pawel Jakub Dawidek wrote:
+> > On Thu, Oct 06, 2005 at 01:08:02PM -0700, Danny Howard wrote:
+> 
+> > +> Has anyone a recipe for a RAID1,0 bootstrap? :)
+> > 
+> > Forget it. Everything which splits the data across disks will not work.
+> > With software RAID you can operate on disks, slices, partitions, etc.
+> > no limits here. I'd suggest creating small RAID1 on top of small
+> > partitions for the root file system (or at least for /boot/ directory,
+> > which is minimum).
+> 
+> Well, I have RAID1 systems ...
+> 
+> It seems reasonable to conclude that one could set up / as a RAID1 on
+> the first pair of disks, and bootstrap far enough to include swap, /var,
+> and /usr from a RAID10 stretched across a full-disk set.  It just sounds
+> somewhat tricky to set it all up, is all, so if someone has grokked out
+> a recipe ... :)

This is one of mine setups (5 SATA disks):

beast:root:~# df -h -t ufs
Filesystem          Size    Used   Avail Capacity  Mounted on
/dev/mirror/root    1.9G    228M    1.6G    13%    /
/dev/raid3/usr      3.9G    1.9G    1.7G    53%    /usr
/dev/raid3/data     570G     99G    425G    19%    /usr/home

beast:root:~# graid3 status
      Name    Status  Components
raid3/data  COMPLETE  ad0s1d
                      ad1s1d
                      ad2s1d
                      ad3s1d
                      ad4s1d
 raid3/usr  COMPLETE  ad1s1a
                      ad3s1a
                      ad4s1a

beast:root:~# gmirror status
       Name    Status  Components
mirror/root  COMPLETE  ad0s1a
                       ad2s1a

Next one (RAID1 on three components for root):

puppet:root:~# df -h -t ufs
Filesystem          Size    Used   Avail Capacity  Mounted on
/dev/mirror/root    989M     77M    833M     9%    /
/dev/raid3/usr      3.9G    1.5G    2.0G    43%    /usr
/dev/raid3/home      56G    1.6G     50G     3%    /usr/home

puppet:root:~# gmirror status
       Name    Status  Components
mirror/root  COMPLETE  da0s1a
                       da1s1a
                       da2s1a

puppet:root:~# graid3 status
      Name    Status  Components
 raid3/usr  COMPLETE  da0s1d
                      da1s1d
                      da2s1d
raid3/home  COMPLETE  da0s1e
                      da1s1e
                      da2s1e

But on most of my systems, I've simple RAID1 (this time on whole disks):

whiplash:root:~# df -h -t ufs
Filesystem             Size    Used   Avail Capacity  Mounted on
/dev/mirror/COREs1a    989M     53M    857M     6%    /
/dev/mirror/COREs1d     15G    1.8G     12G    12%    /usr

whiplash:root:~# gmirror status
       Name    Status  Components
mirror/CORE  COMPLETE  da0
                       da1

My home machine is most interesting (RAID3 is configured on top of two
slices and one disk):

slayer:root:~# egrep '^ad[0-9]+' /var/run/dmesg.boot
ad0: 152627MB <WDC WD1600JB-00GVA0 08.02D08> at ata0-master UDMA100
ad1: 76319MB <Seagate ST380021A 3.19> at ata1-master UDMA100
ad2: 114473MB <Seagate ST3120026A 3.01> at ata2-master UDMA100
ad3: 152627MB <WDC WD1600JB-00GVA0 08.02D08> at ata3-master UDMA100

slayer:root:~# df -h -t ufs
Filesystem           Size    Used   Avail Capacity  Mounted on
/dev/mirror/COREa    1.9G    687M    1.1G    38%    /
/dev/mirror/COREd     33G     23G    7.7G    75%    /usr
/dev/raid3/STUFF     217G    214G    626M   100%    /var/ftp

slayer:root:~# gmirror status
       Name    Status  Components
mirror/CORE  COMPLETE  ad0s1
                       ad3s1

slayer:root:~# graid3 status
       Name    Status  Components
raid3/STUFF  COMPLETE  ad0s2
                       ad2
                       ad3s2

Just use your imagination:)

-- 
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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